/Engine/Source/Runtime/Slate/Public/Framework/MetaData/DriverMetaData.h
the automation driver specific metadata type for specifying an Id for a widget
static [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [ISlateMetaData](API\Runtime\SlateCore\Types\ISlateMetaData) > Id ( [FName](API\Runtime\Core\UObject\FName) Tag )